Adam Feuerstein should have to retract his statements that have done damage to good folks that lost money.
Apart from spending the money on a civil complaint against Adam Feuerstein and STAT news for damages, the route is a Securities Class Action case against Anavex, sadly.
If such a complaint will be filed and assuming Anavex have a decent defense counsel, a case won't imo be certified and is unlike to settle because there is no case to be answered.
As an investor though, if a securities class action case does settle then one must have owned and sold shares during the class period at a recognised loss and can then participate in the settlement found relative to the size of a verified claim.